If you’re one of the 2 billion people who uses Facebook, you may have noticed there’s no escaping Mark Zuckerberg. As pointed out by Telecrunch in 2010, the 33-year-old Facebook founder and his wife, Priscilla Chan, cannot be blocked on the social networking site. Don’t believe us? Go ahead and give it try. Once you try to confirm the action, you’ll receive a message that reads: “Block Error. Sorry, there was a problem blocking Mark Zuckerberg. Please try again.”

It may be an annoying system error for some users though Zuckerberg recently told Buzzfeed News the problem will eventually get fixed; however, it may take some time. A Facebook spokesperson shed more light on this bug, insisting it was not deliberate like so many people assume. It’s actually an issue that can affect many profiles.

"I can tell you that people trying to block a profile or Page may see an error message if it has been blocked many times within a short period," the Facebook spokesperson explained to Buzzfeed. "This temporary message does not prevent people from reporting profiles or Pages that they think are in violation of our Community Standards."

This seems to explain why Zuckerberg cannot be blocked, as there have been several "block campaigns" issued against him, most notably, 2010’s Block Zuck, which was reportedly issued in response to Facebook's controversial privacy policies. 

"This error isn't specific to any one account […] In very rare instances, a viral campaign will develop instructing lots of people to all wrongly block the same person," a spokesperson said in 2010. "The purpose of this system is to protect the experience for people targeted by these campaigns. We're constantly working to improve our systems and are taking a closer look at this one."